Hi. I recently had two of my emails at LP spammed. I got 15k messages on one of them and 36k on other. The one I got 36k I didn't really care much about so I just purged inbox completely using PHP imap_delete method. However, the one with 15k messages I need to sort. It takes very long time to load all the messages and squirrelmail and horde do time out. Same goes for Outlook. I can use my own webclient but it is still slow. I found in this topic

http://www.lunarforums.com/lunarpages_web_hosting_email_pc_security/squirrelmail_slow_horde_fine-t36737.0.html;msg274732;topicseen#msg274732

that the reason is too many messages and old mailbox format. Apparently it stores all messages as one file and when your webmail client tries to open one huge file for headers it times out.
Is there a way to change mailbox format?
Can I request this from support?